CN114415770A - Shimming current source device for magnetic resonance equipment - Google Patents
Shimming current source device for magnetic resonance equipment Download PDFInfo
- Publication number
- CN114415770A CN114415770A CN202111583891.4A CN202111583891A CN114415770A CN 114415770 A CN114415770 A CN 114415770A CN 202111583891 A CN202111583891 A CN 202111583891A CN 114415770 A CN114415770 A CN 114415770A
- Authority
- CN
- China
- Prior art keywords
- resistor
- operational amplifier
- analog
- amplifier chip
- digital
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 47
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 15
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
Abstract
The shimming current source device for the magnetic resonance equipment comprises a microcontroller, an upper computer, a digital-to-analog conversion chip, an amplifying circuit, an analog-to-digital conversion chip, a temperature detection module, a current detection module and a power module, wherein the upper computer, the digital-to-analog conversion chip, the analog-to-digital conversion chip and the temperature detection module are respectively electrically connected with the microcontroller, the amplifying circuit is connected in series between the analog-to-digital conversion chip and the temperature detection module and is electrically connected with the digital-to-analog conversion chip, and the power module is respectively electrically connected with the microcontroller, the digital-to-analog conversion chip, the amplifying circuit, the analog-to-digital conversion chip, the temperature detection module and the current detection module. The invention has the characteristics of good current stability, high control precision, direct control of output current through an upper computer, real-time monitoring of circuit state, display of current value, dynamic modification of output current data, simultaneous driving of multi-channel shimming coils and the like.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of magnetic resonance for medical diagnosis, in particular to a shimming current source device for magnetic resonance equipment.
[ background of the invention ]
With the development of science and technology, a plurality of constant current driving devices are needed in scientific research and engineering application occasions, so that stable constant large current is provided, constant current discharge of a plurality of circuits of low-voltage loads is realized, and the requirement of distributed multi-channel control is met. At present, direct current constant current driving is generally applied, but most devices are poor in current adjustability, the current size is difficult to dynamically change according to user requirements, and the precision of constant current is not very high. The accuracy of the selected components is limited, and the cost is increased to improve the accuracy, so that the practicability is greatly limited. In addition, when multiple independent constant current drives are needed in a system and uniform control is needed, no better solution is available at present.
In the prior art, someone realizes constant current through a power amplifying circuit, a signal conditioning circuit, a reference voltage circuit, a D/A circuit, a microcontroller, an RS485 communication interface and an upper computer structure, however, the temperature of a main operational amplifier chip cannot be monitored in real time and fed back to an MCU for processing, so that the problem caused by overhigh circuit temperature cannot be avoided.
[ summary of the invention ]
The shimming current source device for the magnetic resonance equipment has the advantages of good current stability and high control precision, can directly control output current through shimming current source software, monitors the circuit state in real time, displays the current value, can dynamically modify output current data, and can simultaneously drive a plurality of shimming coils.
In order to achieve the above object, the present invention provides a shimming current source device for a magnetic resonance apparatus, the device comprises a microcontroller, an upper computer, a digital-to-analog conversion chip, an amplifying circuit, an analog-to-digital conversion chip, a temperature detection module, a current detection module and a power supply module, the upper computer, the digital-to-analog conversion chip, the analog-to-digital conversion chip and the temperature detection module are respectively and electrically connected with the microcontroller, the amplifying circuit is connected in series between the analog-to-digital conversion chip and the temperature detection module, and is electrically connected with the digital-to-analog conversion chip, the current detection module is connected between the analog-to-digital conversion chip and the amplifying circuit, the power module is respectively and electrically connected with the microcontroller, the digital-to-analog conversion chip, the amplifying circuit, the analog-to-digital conversion chip, the temperature detection module and the current detection module.
The amplifying circuit comprises a first operational amplifier chip and a second operational amplifier chip, the first operational amplifier chip and the second operational amplifier chip are symmetrically arranged into a push-pull structure, and the input end of the first operational amplifier chip and the second operational amplifier chip is connected with a positive reference voltage to obtain positive and negative bipolar output currents. .
The input end of the first operational amplifier chip is connected with a filter circuit, the filter circuit comprises a capacitor C1, a resistor R7 and a resistor R9 which are connected with the positive input end of the first operational amplifier chip, and a resistor R3, a resistor R6 and a resistor R8 which are connected with the negative input end of the first operational amplifier chip, the other end of the resistor R9 is connected with a reference voltage, the other end of the resistor R8 is connected with an input voltage, a capacitor C2 is connected in parallel between the resistor R8 and the resistor R6 and between the resistor R7 and the resistor R9, the output end of the first operational amplifier chip is connected with the output end of the second operational amplifier chip through a resistor R10, an inductor L1 and a resistor R13, the negative input end and the output end of the first operational amplifier chip are connected with a resistor R1, a resistor R2 and a capacitor C3 in parallel, and the positive input end and the output end of the first operational amplifier chip are connected with a resistor R5, a resistor R4 and a capacitor C4 in parallel.
The positive input end of the second operational amplifier chip is connected with a resistor R15 and a resistor R16, one end of the resistor R15 is connected with an input power supply, one end of the resistor R16 is grounded, the output end of the second operational amplifier chip is connected with the resistor R13 in series, and a resistor R14 is connected between the negative input end and the output end of the second operational amplifier chip in parallel.
The digital-to-analog conversion chip is provided with eight voltage output channels, and the eight voltage output channels are respectively and electrically connected with the eight amplifying circuits.
The power module can step down the main power supply to a plurality of different voltages which can supply power to different chips.
The device is connected with an upper computer through a USB wire, the upper computer is a computer, and a program for controlling the shimming current source to output multi-channel current and displaying the detected current value of the multi-channel and whether the current temperature is too high is arranged in the computer.
The contribution of the present invention is that it effectively solves the problems existing in the prior art. The invention can directly control the output current through shimming current source software, monitor the circuit state in real time, dynamically display the current value, dynamically modify the output current data and simultaneously drive a plurality of shimming coils. The invention forms a push-pull structure by two operational amplifier chips, wherein one operational amplifier chip outputs current and the other operational amplifier chip absorbs current, thereby making different compensations to different loads and flexibly setting and changing the gain of the amplifying circuit. Therefore, the method has the characteristics of good current stability, high control precision and the like.
[ description of the drawings ]
Fig. 1 is a block diagram of the overall structure of the present invention.
Fig. 2 is a circuit diagram of the present invention.
[ detailed description ] embodiments
The following examples are further illustrative and explanatory of the present invention and are not to be construed as limiting the invention in any way.
Referring to fig. 1, the shim current source apparatus for a magnetic resonance device according to the present invention includes a microcontroller 10, an upper computer 20, a digital-to-analog conversion chip 30, an amplification circuit 40, an analog-to-digital conversion chip 50, a temperature detection module 60, a current detection module 70, and a power supply module 80.
As shown in fig. 1 and fig. 2, the upper computer 20, the digital-to-analog conversion chip 30, the analog-to-digital conversion chip 50 and the temperature detection module 60 are electrically connected to the microcontroller 10, wherein the microcontroller 10 is a central processing unit of the device and is responsible for controlling various instructions and processing signals. The upper computer 20 is a computer with a built-in control APP, and can control the microcontroller 10 to control the multi-channel digital-to-analog conversion chip 30 and display the detected current values of the multiple channels and the function of whether the current temperature is too high or not. The digital-to-analog conversion chip 30 is electrically connected to the microcontroller 10 and the amplifying circuit 40, and is configured to convert a digital quantity into an analog quantity, and convert a digital voltage output by the microcontroller 10 into an analog voltage for output. In this embodiment, the digital-to-analog conversion chip 30 has eight voltage output channels, and the eight voltage output channels are electrically connected to the eight amplifying circuits 40, respectively. The APP of the computer 20 can send a command to control the 8-channel digital-to-analog conversion chip 30 to work simultaneously, and the computer APP can display the detected current values of the 8 channels and whether the current temperature is too high. The analog-to-digital conversion chip 50 is electrically connected to the amplifying circuit 40 and the microcontroller 10, respectively, and is configured to convert an analog voltage value output by the amplifying circuit 40 into a digital voltage value for display. The amplifying circuit 40 is connected in series between the analog-to-digital conversion chip 50 and the temperature detecting module 60, and is electrically connected to the digital-to-analog conversion chip 30, and the temperature detecting module 60 is configured to stop the voltage output of the digital-to-analog conversion chip 30 through the microcontroller 10 when the temperatures of the first operational amplifier chip 41 and the second operational amplifier chip 42 are too high, so as to protect the circuit. The current detection module 70 is connected between the analog-to-digital conversion chip 50 and the amplifying circuit 40, and is configured to collect a current value in the amplifying circuit 40 and transmit the current value to the analog-to-digital conversion chip 50.
As shown in fig. 2, the amplifying circuit 40 includes a first operational amplifier chip 41 and a second operational amplifier chip 42, the first operational amplifier chip 41 and the second operational amplifier chip 42 are symmetrically configured as a push-pull structure, and the push-pull structure also constitutes a feedback, in the first operational amplifier chip 41 and the second operational amplifier chip 42, the first operational amplifier chip 41 outputs current at the same time, and the second operational amplifier chip 42 absorbs current at the same time, so that different compensations can be made for different loads, and the gain of the amplifying circuit can be changed and flexibly set. The amplifier circuit 40 is configured as shown in fig. 2, an input end of the first operational amplifier chip 41 is connected to a filter circuit 43, the filter circuit 43 includes a capacitor C1, a resistor R7, a resistor R9, a resistor R3, a resistor R6, and a resistor R8, wherein the capacitor C1, the resistor R7, and the resistor R9 are connected to a positive input end of the first operational amplifier chip 41, another end of the resistor R9 is connected to a reference voltage, and another end of the resistor R8 is connected to an input voltage. The resistor R3, the resistor R6, and the resistor R8 are connected to the negative input terminal of the first operational amplifier chip 41. And a capacitor C2 is connected in parallel between the resistor R8 and the resistor R6 and between the resistor R7 and the resistor R9. The output end of the first operational amplifier chip 41 is connected with the output end of the second operational amplifier chip 42 through a resistor R10, an inductor L1 and a resistor R13, and the resistor R10 and the resistor R13 are sampling resistors and are used for collecting the output current of the operational amplifier and feeding the output current back to the microcontroller 10. The negative input end and the output end of the first operational amplifier chip 41 are connected in parallel with a resistor R1, a resistor R2 and a capacitor C3, the positive input end and the output end of the first operational amplifier chip 41 are connected in parallel with a resistor R5, a resistor R4 and a capacitor C4, and resistors R1 and R5 are used for adjusting the gain of the amplifier circuit and can be set to be a set gain, in this embodiment, the set gain is 1V/a, that is, 1V voltage is input, 1A current is output, and the ratio is 1, so that the precision can be effectively improved. The resistor R2, the capacitor C3, the resistor R4 and the capacitor C4 are used for adjusting the response time of the circuit according to different loads. The inductor L1 is an analog load. The positive input end of the second operational amplifier chip 42 is connected with a resistor R15 and a resistor R16, one end of the resistor R15 is connected with an input power supply, and one end of the resistor R16 is grounded. The output end of the second operational amplifier chip 42 is connected in series with the resistor R13, and a resistor R14 is connected in parallel between the negative input end and the output end of the second operational amplifier chip 42. The power module 80 is electrically connected to the microcontroller 10, the digital-to-analog conversion chip 30, the amplifying circuit 40, the analog-to-digital conversion chip 50, the temperature detection module 60, and the current detection module 70, respectively, and is configured to step down a main power supply to a plurality of different voltages capable of supplying power to different chips, including 12V to 5V, 5V to 3.3V, 5V to 2.5V, and 12V to 12V _ STB _ F.
When the device works, after being electrified, the microcontroller 10 enters a main program to initialize the digital-to-analog conversion chip 30, the analog-to-digital conversion chip 50, each serial port and the related I/O port. After the initialization is completed, the microcontroller 10 enters a main loop, waits for the instruction sent by the upper computer 20, sets the output current value of each channel according to the instruction after receiving the instruction, collects the current value through the analog-to-digital conversion chip 50 and sends the current value to the upper computer 20, and the upper computer displays various states of the current circuit.
Therefore, the present invention can directly control the output current through the upper computer 20, monitor the circuit state in real time, dynamically display the current value, dynamically modify the output current data, and simultaneously drive the multi-way shimming coils.
Although the present invention has been described with reference to the above embodiments, the scope of the present invention is not limited thereto, and modifications, substitutions and the like of the above members are intended to fall within the scope of the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. The shimming current source device for the magnetic resonance equipment is characterized by comprising a microcontroller (10), an upper computer (20), a digital-to-analog conversion chip (30), an amplifying circuit (40), an analog-to-digital conversion chip (50), a temperature detection module (60), a current detection module (70) and a power supply module (80), wherein the upper computer (20), the digital-to-analog conversion chip (30), the analog-to-digital conversion chip (50) and the temperature detection module (60) are respectively and electrically connected with the microcontroller (10), the amplifying circuit (40) is connected between the analog-to-digital conversion chip (50) and the temperature detection module (60) in series and is electrically connected with the digital-to-analog conversion chip (30), the current detection module (70) is connected between the analog-to-digital conversion chip (50) and the amplifying circuit (40), and the power supply module (80) is respectively connected with the microcontroller (10), The digital-to-analog conversion chip (30), the amplifying circuit (40), the analog-to-digital conversion chip (50), the temperature detection module (60) and the current detection module (70) are electrically connected.
2. The shim current source arrangement for a magnetic resonance apparatus according to claim 1, wherein the amplifying circuit (40) comprises a first operational amplifier chip (41) and a second operational amplifier chip (42), the first operational amplifier chip (41) and the second operational amplifier chip (42) are symmetrically arranged in a push-pull configuration, and a positive reference voltage is applied to an input terminal of the first operational amplifier chip (41) and an input terminal of the second operational amplifier chip (42) to obtain positive and negative bipolar output currents.
3. The shim current source apparatus for a magnetic resonance device according to claim 2, wherein the input terminal of the first operational amplifier chip (41) is connected to a filter circuit (43), the filter circuit (43) includes a capacitor C1, a resistor R7, a resistor R9 connected to the positive input terminal of the first operational amplifier chip (41), a resistor R3, a resistor R6, and a resistor R8 connected to the negative input terminal of the first operational amplifier chip (41), the other terminal of the resistor R9 is connected to a reference voltage, the other terminal of the resistor R8 is connected to an input voltage, a capacitor C2 is connected between the resistor R8 and the resistor R6 and between the resistor R7 and the resistor R9, the output terminal of the first operational amplifier chip (41) is connected to the output terminal of the second operational amplifier chip (42) through a resistor R10, an inductor L1, and a resistor R13, and the negative input terminal and the output terminal of the first operational amplifier chip (41) are connected in parallel to the resistor R1, The positive input end and the output end of the first operational amplifier chip (41) are connected with a resistor R2 and a capacitor C3 in parallel, and the resistor R5, the resistor R4 and the capacitor C4 are connected with the positive input end and the output end of the first operational amplifier chip (41) in parallel.
4. The shim current source apparatus for a magnetic resonance device according to claim 2, wherein the positive input terminal of the second operational amplifier chip (42) is connected with a resistor R15 and a resistor R16, one terminal of the resistor R15 is connected with an input power supply, one terminal of the resistor R16 is connected with ground, the output terminal of the second operational amplifier chip (42) is connected with the resistor R13 in series, and a resistor R14 is connected between the negative input terminal and the output terminal of the second operational amplifier chip (42) in parallel.
5. The shim current source arrangement for a magnetic resonance apparatus according to claim 1, wherein the digital-to-analog conversion chip (30) has eight voltage output channels, which are electrically connected to eight of the amplification circuits (40), respectively.
6. Shimming current source arrangement for a magnetic resonance device according to claim 1, characterized in that the power supply module (80) is operable to step down a main power supply to a plurality of different voltages operable to power different chips.
7. The shimming current source device for the magnetic resonance equipment according to claim 1, wherein the device is connected with an upper computer (20) through a USB wire, the upper computer (20) is a computer, and a program for controlling the shimming current source to output multi-channel current and displaying the detected multi-channel current value and whether the current temperature is too high is arranged in the computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111583891.4A CN114415770B (en) | 2021-12-22 | 2021-12-22 | Shimming current source device for magnetic resonance equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111583891.4A CN114415770B (en) | 2021-12-22 | 2021-12-22 | Shimming current source device for magnetic resonance equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114415770A true CN114415770A (en) | 2022-04-29 |
| CN114415770B CN114415770B (en) | 2023-11-14 |
Family
ID=81267078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111583891.4A Active CN114415770B (en) | 2021-12-22 | 2021-12-22 | Shimming current source device for magnetic resonance equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114415770B (en) |
Citations (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10283044A (en) * | 1997-04-04 | 1998-10-23 | Asia Electron Inc | Constant current power unit |
| US6211657B1 (en) * | 2000-05-18 | 2001-04-03 | Communications & Power Industries, Inc. | Two stage power converter with interleaved buck regulators |
| CN101089937A (en) * | 2006-06-15 | 2007-12-19 | 晶门科技有限公司 | Source drive amplifier for flat panel display |
| CN101236218A (en) * | 2008-02-26 | 2008-08-06 | 浙江大学 | AC/DC converter power switch tube drain voltage detection circuit |
| CN101526563A (en) * | 2009-04-07 | 2009-09-09 | 北京华视通广科技有限公司 | Motoring device for current input voltage output |
| CN101673947A (en) * | 2009-10-13 | 2010-03-17 | 厦门大学 | Superconducting magnet room temperature shim power |
| CN202177842U (en) * | 2011-06-15 | 2012-03-28 | 网拓(上海)通信技术有限公司 | Constant current source |
| CN103092081A (en) * | 2012-12-28 | 2013-05-08 | 北京控制工程研究所 | Embedded motor and load power level simulation system |
| CN103135081A (en) * | 2011-11-30 | 2013-06-05 | 西门子公司 | Magnetic resonance radiography device, method for balancing out a field inhomogeneity and shim coil arrangement |
| US20130181717A1 (en) * | 2012-01-13 | 2013-07-18 | Toshiba Medical Systems Corporation | Power supply circuit and magnetic resonance imaging apparatus |
| CN103246307A (en) * | 2013-04-11 | 2013-08-14 | 航天科工惯性技术有限公司 | Program-control current source |
| CN203350754U (en) * | 2013-04-11 | 2013-12-18 | 航天科工惯性技术有限公司 | Program control current source |
| CN104820456A (en) * | 2014-01-31 | 2015-08-05 | 美国亚德诺半导体公司 | Current source calibration tracking temperature and bias current |
| US20150248135A1 (en) * | 2014-02-28 | 2015-09-03 | Samsung Electronics Co., Ltd. | Method and electronic device for controlling current |
| WO2016179964A1 (en) * | 2015-05-08 | 2016-11-17 | 中兴通讯股份有限公司 | Detection circuit and detection method for high-side current |
| CN106773893A (en) * | 2016-11-11 | 2017-05-31 | 东南大学 | The program controlled constant current source circuit of the device for force feedback based on magnetic flow liquid |
| CN107086433A (en) * | 2017-06-15 | 2017-08-22 | 北京航空航天大学 | A kind of integrated magnetic resonance gyroscope laser power and frequency stabilization system |
| CN107153381A (en) * | 2017-06-15 | 2017-09-12 | 北京航空航天大学 | A kind of integrated magnetic resonance gyroscope magnetic-field closed loop numerical control system |
| CN107202968A (en) * | 2017-04-27 | 2017-09-26 | 上海交通大学 | It is a kind of for the multichannel shim current source of magnetic resonance imaging and its operation method |
| CN108303586A (en) * | 2017-10-20 | 2018-07-20 | 博众精工科技股份有限公司 | A kind of power test device |
| CN208953155U (en) * | 2018-09-19 | 2019-06-07 | 湖南福德电气有限公司 | A kind of multi-channel temperature measurement circuit |
| CN113204260A (en) * | 2021-04-30 | 2021-08-03 | 武汉中科牛津波谱技术有限公司 | Multi-channel high-precision current source and working method thereof |
| CN113359920A (en) * | 2021-06-16 | 2021-09-07 | 广东电网有限责任公司 | High-stability direct current source and control system |
| CN214251093U (en) * | 2020-12-29 | 2021-09-21 | 广州市紫晶通信科技有限公司 | Communication power supply detection equipment |
| CN113433999A (en) * | 2021-07-12 | 2021-09-24 | 北京航空航天大学 | High-precision low-noise program-controlled current source for magnetic field generation |
-
2021
- 2021-12-22 CN CN202111583891.4A patent/CN114415770B/en active Active
Patent Citations (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10283044A (en) * | 1997-04-04 | 1998-10-23 | Asia Electron Inc | Constant current power unit |
| US6211657B1 (en) * | 2000-05-18 | 2001-04-03 | Communications & Power Industries, Inc. | Two stage power converter with interleaved buck regulators |
| CN101089937A (en) * | 2006-06-15 | 2007-12-19 | 晶门科技有限公司 | Source drive amplifier for flat panel display |
| CN101236218A (en) * | 2008-02-26 | 2008-08-06 | 浙江大学 | AC/DC converter power switch tube drain voltage detection circuit |
| CN101526563A (en) * | 2009-04-07 | 2009-09-09 | 北京华视通广科技有限公司 | Motoring device for current input voltage output |
| CN101673947A (en) * | 2009-10-13 | 2010-03-17 | 厦门大学 | Superconducting magnet room temperature shim power |
| CN202177842U (en) * | 2011-06-15 | 2012-03-28 | 网拓(上海)通信技术有限公司 | Constant current source |
| CN103135081A (en) * | 2011-11-30 | 2013-06-05 | 西门子公司 | Magnetic resonance radiography device, method for balancing out a field inhomogeneity and shim coil arrangement |
| US20130181717A1 (en) * | 2012-01-13 | 2013-07-18 | Toshiba Medical Systems Corporation | Power supply circuit and magnetic resonance imaging apparatus |
| CN103092081A (en) * | 2012-12-28 | 2013-05-08 | 北京控制工程研究所 | Embedded motor and load power level simulation system |
| CN103246307A (en) * | 2013-04-11 | 2013-08-14 | 航天科工惯性技术有限公司 | Program-control current source |
| CN203350754U (en) * | 2013-04-11 | 2013-12-18 | 航天科工惯性技术有限公司 | Program control current source |
| CN104820456A (en) * | 2014-01-31 | 2015-08-05 | 美国亚德诺半导体公司 | Current source calibration tracking temperature and bias current |
| US20150248135A1 (en) * | 2014-02-28 | 2015-09-03 | Samsung Electronics Co., Ltd. | Method and electronic device for controlling current |
| WO2016179964A1 (en) * | 2015-05-08 | 2016-11-17 | 中兴通讯股份有限公司 | Detection circuit and detection method for high-side current |
| CN106773893A (en) * | 2016-11-11 | 2017-05-31 | 东南大学 | The program controlled constant current source circuit of the device for force feedback based on magnetic flow liquid |
| CN107202968A (en) * | 2017-04-27 | 2017-09-26 | 上海交通大学 | It is a kind of for the multichannel shim current source of magnetic resonance imaging and its operation method |
| CN107086433A (en) * | 2017-06-15 | 2017-08-22 | 北京航空航天大学 | A kind of integrated magnetic resonance gyroscope laser power and frequency stabilization system |
| CN107153381A (en) * | 2017-06-15 | 2017-09-12 | 北京航空航天大学 | A kind of integrated magnetic resonance gyroscope magnetic-field closed loop numerical control system |
| CN108303586A (en) * | 2017-10-20 | 2018-07-20 | 博众精工科技股份有限公司 | A kind of power test device |
| CN208953155U (en) * | 2018-09-19 | 2019-06-07 | 湖南福德电气有限公司 | A kind of multi-channel temperature measurement circuit |
| CN214251093U (en) * | 2020-12-29 | 2021-09-21 | 广州市紫晶通信科技有限公司 | Communication power supply detection equipment |
| CN113204260A (en) * | 2021-04-30 | 2021-08-03 | 武汉中科牛津波谱技术有限公司 | Multi-channel high-precision current source and working method thereof |
| CN113359920A (en) * | 2021-06-16 | 2021-09-07 | 广东电网有限责任公司 | High-stability direct current source and control system |
| CN113433999A (en) * | 2021-07-12 | 2021-09-24 | 北京航空航天大学 | High-precision low-noise program-controlled current source for magnetic field generation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114415770B (en) | 2023-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110196613A (en) | A kind of power supply device for DUT in integrated circuit test system | |
| CN104865515A (en) | Multichannel integrated operational amplifier performance parameter on-line testing system | |
| CN111142008B (en) | Circuit board power parameter testing system and method | |
| CN102306903A (en) | Digital large power semiconductor laser power supply | |
| CN106646275A (en) | DC/DC testing system and method | |
| CN202631620U (en) | Optical module intelligent test board | |
| CN114415770A (en) | Shimming current source device for magnetic resonance equipment | |
| CN105305826A (en) | Multi-output switching power supply circuit | |
| CN206178101U (en) | A adjustable surge load test device for electromagnetic relay | |
| CN107272484B (en) | Multi-power supply management device for electronic product | |
| CN104345759A (en) | Direct and constant-current source acquisition device | |
| CN217469917U (en) | Channel switching circuit and electronic equipment | |
| CN116360540A (en) | Voltage regulating system and voltage regulating method for chip test | |
| CN207703935U (en) | Wide-range voltage harvester is mutually isolated in a kind of multichannel | |
| CN206726080U (en) | Mu balanced circuit and power supply circuit, remote control with the mu balanced circuit | |
| CN216561571U (en) | Test system and device of multichannel constant current electronic load | |
| CN213126208U (en) | Signal switching device and system | |
| CN210037739U (en) | Multi-channel sensor controllable circuit, selective control module and VOC gas sensor aging device | |
| CN115989419A (en) | System and method for generating and measuring electrical signals | |
| CN114337317A (en) | Source meter circuit adopting four-quadrant driving mode | |
| CN206274366U (en) | Self-adapting multi-channel power supply real-time monitoring circuit system | |
| CN111953499A (en) | Intelligent board card debugging power supply device | |
| CN219997237U (en) | Monitoring circuit chip test system | |
| CN105159380A (en) | Multi-channel separation constant voltage and flow source | |
| CN214174513U (en) | Data acquisition equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |